Collect unmapped entries in dry-run mode

See museum-digital/importer#235

src/MDConcOwnershipStatus.php

@@ -65,7 +65,8 @@ final class MDConcOwnershipStatus implements MDImporterConcordanceListInterface
             if (isset(self::OWNERSHIP_TYPES_VERBOSE[trim($input)])) {
                 return self::OWNERSHIP_TYPES_VERBOSE[trim($input)];
             }
-            throw MDImporterMissingConcordance::setup("ownership", $input);
+            MDImporterMissingConcordance::throw("ownership", $input);
+            return 'deaccessed'; // Return default in dry-run mode
         }
 
         return self::OWNERSHIP_TYPES_VERBOSE[$input];